Physicists from Cambridge, University College London, and the University of Gdansk have developed a protocol to provide an optimal solution in which the entangled state is ‘recycled’, so that the gateway between particles holds for the teleportation of multiple objects. They have even devised a protocol in which multiple qubits can be teleported simultaneously, although the entangled state degrades proportionally to the amount of qubits sent in both cases. “The first protocol consists of sequentially teleporting states, and the second teleports them in a bulk,” said Sergii Strelchuck from Cambridge’s Department of Applied Mathematics and Theoretical Physics, who led the research with colleagues Jonathan Oppenheim of UCL and Michal Horodecki of the University of Gdansk. “We have also found a generalised teleportation technique which we hope will find applications in areas such as quantum computation.” Einstein famously loathed the theory of quantum entanglement, dismissing it as “spooky action at a distance”. But entanglement has since been proven to be a very real feature of our universe, and one that has extraordinary potential to advance all manner of scientific endeavor.
“There is a close connection between teleportation and quantum computers, which are devices which exploit quantum mechanics to perform computations which would not be feasible on a classical computer,” said Strelchuck. “Building a quantum computer is one of the great challenges of modern physics, and it is hoped that the new teleportation protocol will lead to advances in this area.” While this protocol is completely theoretical, last year a team of Chinese scientists reported teleporting photons over 143km, breaking previous records, and quantum entanglement is increasingly seen as an important area of scientific investment. Teleportation of information carried by single atoms is feasible with current technologies, but the teleportation of large objects - such as Captain Kirk - remains in the realm of science fiction. Adds Strelchuck: “Entanglement can be thought of as the fuel, which powers teleportation. Our protocol is more fuel efficient, able to use entanglement thriftily while eliminating the need for error correction.
La Policía ha capturado esta mañana a los integrantes de una red de trata de neuróticas de clase media alta que operaba en Barcelona. 'Eran todos de nacionalidad argentina y habían alquilado un local en el barrio de Pedralbes.
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